Answer:

Step-by-step explanation:
,
,
, Subtract 23 and 3x from both sides and simplify:
, Divide both sides by 2 and simplify: 
<em>Hope this helps!!!</em>
Answer:
the queation says from ques no 2 so you should take a full picture
a) the independent variable is the number of training miles.
b) the dependent variable is the cost to mail the package
c) the dependent variable is P